EP0155572A2 - Dispositif pour éviter la formation de la rosée et du givre sur la signalisation routière - Google Patents

Dispositif pour éviter la formation de la rosée et du givre sur la signalisation routière Download PDF

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Publication number
EP0155572A2
EP0155572A2 EP85102315A EP85102315A EP0155572A2 EP 0155572 A2 EP0155572 A2 EP 0155572A2 EP 85102315 A EP85102315 A EP 85102315A EP 85102315 A EP85102315 A EP 85102315A EP 0155572 A2 EP0155572 A2 EP 0155572A2
Authority
EP
European Patent Office
Prior art keywords
heat
traffic sign
road sign
reflector
radiator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP85102315A
Other languages
German (de)
English (en)
Other versions
EP0155572A3 (fr
Inventor
Peter Dipl.-Phys. Trubiroha
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TRUBIROHA, PETER, DIPL.-PHYS.
Original Assignee
Beiersdorf AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beiersdorf AG filed Critical Beiersdorf AG
Publication of EP0155572A2 publication Critical patent/EP0155572A2/fr
Publication of EP0155572A3 publication Critical patent/EP0155572A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F7/00—Signs, name or number plates, letters, numerals, or symbols; Panels or boards
    • G09F7/002—Signs, name or number plates, letters, numerals, or symbols; Panels or boards weather-proof panels or boards

Definitions

  • the invention relates to a device for preventing the formation of dew and frost on traffic sign carriers (traffic signs) which are equipped with retroreflective elements, in particular with retroreflective foils.
  • Retroreflective traffic signs have become increasingly important in view of the ever increasing traffic density in recent years. Compared to conventional traffic signs, they are characterized by their exceptional luminosity and clear recognition even over long distances, thereby contributing significantly to traffic safety.
  • the basic characteristic of a retroreflective material is its ability to return a luminous cone of light back to the source of an angularly arriving light beam, that is to say that light from a headlight striking such a material is reflected back to the driver's eyes and gives the impression of this as if the reflective material itself was illuminated.
  • retroreflective traffic signs which may consist in particular of a glued-on retroreflective film, is smooth and optically clear.
  • Such a hydrophilic coating which should increase the free energy of the surface and make it easily wettable with water - in the patent literature also known as anti-fogging - or anti-foggant - causes a complete wetting of these surfaces. No optically scattering droplets form during the condensation, but a thin, optically clear water film on these coatings.
  • hydrophilic coatings are relatively poorly resistant to mechanical and weather influences and often do not have the required light fastness. They are therefore easily removed when the surfaces are mechanically cleaned. In addition, they are unable to prevent the likewise light-scattering ice and frost formation.
  • Another known solution to prevent the thawing of surfaces of objects is to attach an artificial, mostly electrically powered heater to them, which ensures that the temperature of the surfaces does not drop below that of the surroundings.
  • This solution is used for example with meteorological rain detectors. It has the disadvantage that it can only be realized in the vicinity of electrical supply lines and causes high costs for larger surfaces due to the energy requirement.
  • the invention has for its object to overcome the disadvantages of the previous methods and to prevent both the thawing and the frost formation of retroreflective traffic signs by a permanent constructive measure without artificial energy supply.
  • This object is achieved in that the cooling of the surface of a traffic sign below the dew point temperature of the surrounding air caused by radiation losses in the sky is excluded by natural heat radiators which are placed above and in front of the traffic sign.
  • the invention thus relates to a device for preventing the formation of dew and frost on retroreflective traffic sign carriers, which is characterized in that a natural heat radiator or heat reflector which functions for and without the supply of external energy is arranged above and in front of the traffic sign carrier (traffic sign) Center of the shield covers a solid angle of at least 0.8 sr (steradian), preferably a solid angle of 1.6 sr to 2.2 sr.
  • the retroreflective material can consist of different material, in particular a retroreflective film, which is caused by the glass ball and mirror coating existing reflective layer has excellent reflectivity.
  • the plastic layer (topcoat layer or topcoat layers) of such foils ensures a good bond between the foils and protects them adequately against wear, whereas the adhesive layer (self-adhesive layer) ensures long-lasting adhesion and firm attachment to the traffic sign carrier (traffic sign).
  • the retroreflective material can consist of a material which is flat on its side facing the light to be reflected, but the other surfaces of which, according to a regular pattern, have evenly distributed and closely spaced triple mirrors.
  • the heat radiator which is made in particular from anodized aluminum, is preferably rectangular and is advantageously attached directly to the upper edge of the traffic sign. Additional heat radiators (heat reflectors) can be arranged on both sides of the traffic sign. It is also advantageous to provide an open area (opening) between the location of the heat radiator (heat reflector) on the traffic sign and the heat radiator (heat reflector) itself, which enables the natural cleaning of the retroreflective film surface in the rain.
  • the heat radiator (heat reflector) can also consist of a plurality of inclined, lamellar heat radiators arranged parallel and at a distance from one another. This embodiment allows wind and snow loads on the traffic sign as well as the material consumption in the manufacture of the heat radiator be significantly reduced.
  • the radiation losses are compensated by the sizes L and E. Above all on nights with a clear sky (up to 250 nights a year), the above-mentioned radiation losses are so high that even the dew point temperature t d of the surrounding air on the film surface is undershot, the energy balance of the surface then has the shape with K: energy supply through the condensation energy during the formation of dew and frost on the surface.
  • the energy supply by E E , L and E can only be increased in vertical traffic sign areas by measures that require an external energy supply, for example
  • the energy supply can be increased by the size E A , in that, according to the invention, the counter-radiation of cold high layers of the atmosphere, which is weak at night, is increased by the radiation from natural sheet-like heat radiators of the temperature t w t L.
  • the energy supply can also be increased by E E by tilting the surface carrying the traffic sign forward by a small angle (up to approximately 20 °). Since with this measure the irradiance of E E increases faster than E decreases, the sum of the energy supply E + E increases. L and E remain the same.
  • the device according to the invention can be implemented by many other embodiments are without departing from the scope of the invention.
  • the legibility of the sign must not be impaired in any way. Rather, the lettering must always remain fully visible.
EP85102315A 1984-03-17 1985-03-01 Dispositif pour éviter la formation de la rosée et du givre sur la signalisation routière Withdrawn EP0155572A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3409915 1984-03-17
DE19843409915 DE3409915A1 (de) 1984-03-17 1984-03-17 Vorrichtung zur verhinderung der tau- und reifbildung auf verkehrszeichen

Publications (2)

Publication Number Publication Date
EP0155572A2 true EP0155572A2 (fr) 1985-09-25
EP0155572A3 EP0155572A3 (fr) 1986-06-04

Family

ID=6230861

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85102315A Withdrawn EP0155572A3 (fr) 1984-03-17 1985-03-01 Dispositif pour éviter la formation de la rosée et du givre sur la signalisation routière

Country Status (2)

Country Link
EP (1) EP0155572A3 (fr)
DE (1) DE3409915A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10128013A1 (de) * 2001-06-05 2002-12-12 Uwe Slabke Verfahren zur Verwendung von hydrophilen Schichten/Folien zur Verhinderung der Tau- und Reifbildung auf Verkehrszeichen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1699926A (en) * 1926-10-11 1929-01-22 Peter B Bentz Street-intersection traffic mirror
DE1534575A1 (de) * 1966-02-08 1969-05-22 Otnott Henry J Spiegelvorrichtung fuer eine Strassenkreuzung
DE2151302A1 (de) * 1971-10-11 1973-04-19 Willi R Berndt Sicherheitsschutz fuer verkehrseinrichtungen
DE3208914A1 (de) * 1982-03-12 1983-09-22 Wolf GmbH, 4190 Kleve Informationsschild, insbesondere zum anbringen im freien

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7237001U (de) * 1973-06-07 Spannuth D Vorrichtung zum Freihalten von Sicht spiegeln von Kondensaten aus atmosphan scher Feuchtigkeit
US3488215A (en) * 1968-06-21 1970-01-06 Nat Patent Dev Corp Nonfogging transparent material
AT357069B (de) * 1975-06-25 1980-06-10 Ebinger Georg Jun Reflektierendes schild, insbesondere verkehrszeichen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1699926A (en) * 1926-10-11 1929-01-22 Peter B Bentz Street-intersection traffic mirror
DE1534575A1 (de) * 1966-02-08 1969-05-22 Otnott Henry J Spiegelvorrichtung fuer eine Strassenkreuzung
DE2151302A1 (de) * 1971-10-11 1973-04-19 Willi R Berndt Sicherheitsschutz fuer verkehrseinrichtungen
DE3208914A1 (de) * 1982-03-12 1983-09-22 Wolf GmbH, 4190 Kleve Informationsschild, insbesondere zum anbringen im freien

Also Published As

Publication number Publication date
EP0155572A3 (fr) 1986-06-04
DE3409915A1 (de) 1985-09-26

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